To construct an oscillating gravity device, cut the bottom of a tapered candle to expose the wick. Push a needle through the candle's middle, creating a pivot point when the candle balances between the rims of two drinking glasses. Place a small plate or other container underneath each candle end, and light the wick on each end. Observe how the effects of gravity on the candle change as its mass changes.
Using string, attach a paper cup to a helium balloon. Place household objects, such as paper clips, cotton balls, buttons and marbles, in the paper cup until you find the amount allowing the balloon to rise slowly to the ceiling. Be sure to document the amount and results of the experiment for each material you test.
Fill a baking dish or tray with enough flour to create an even layer. Drop marbles or pebbles into the flour from a variety of angles and heights. Before each test, make a hypothesis. Document procedures used and each test's results. Compare your craters to those on the surface of the moon.
Insert moistened, folded paper towels into zippered storage bags and add a few fast-growing seeds of radishes, tomatoes, basil or thyme. Carefully close the bag, leaving a small amount of air inside. Place one bag upright and lay one flat. Rotate the upright bag 90 degrees each day. Carefully spritz with water daily and compare the results.